Questions about SAR in light of MH370

A couple of questions spring to mind, they might have very simple answers but I wondered if anyone could fill me in.

Firstly would it not have been more effective and efficient to have airborne refuelling assisting the search rather than only getting an hour on station and then having to travel hours back to base each time?

Secondly the aircraft have spotted debris of some sort today but have now got to return home and hope a ship can re-find it on Saturday. Is there nothing that could have been dropped into the debris field to help guide the ships? At least it would move with the currents unlike a gps fix.

Thirdly would this kind of thing not benefit from a seaplane SAR that could actually land (in appropriate conditions) so that things could be collected? Sadly not the case this time but if survivors were in the sea I’d imagine it would be a bit disappointing to see the Orion heading off for home again.